package com.sunq.studio.utils;

import com.sunq.studio.sys.vo.PayVo;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang3.StringUtils;
import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.input.SAXBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.math.BigDecimal;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.*;


/**
 * Created by sunq on 2019/7/9.
 */
public class PayUtils {

    static Logger logger= LoggerFactory.getLogger(PayUtils.class);

    public static Map WXpayOrder(PayVo payVo){


        BigDecimal money=new BigDecimal(payVo.getPayMoney()).multiply(new BigDecimal("100"));
        payVo.setMoneyCent(money.intValue());

        try {
            //生成的随机字符串
            String nonce_str = getRandomStringByLength(32);
            //商品名称
            String body = payVo.getBody();
            //获取客户端的ip地址
            String spbill_create_ip =payVo.getSpbillCreateIp();// getIpAddr(request);
            String openId=payVo.getOpenid();
            String payOrderId=payVo.getPayOrderId();
            //组装参数，用户生成统一下单接口的签名
            Map<String, String> packageParams = new HashMap<>();
            packageParams.put("appid", WxConfig.appid);
            packageParams.put("mch_id", WxConfig.mch_id);
            packageParams.put("nonce_str", nonce_str);
            packageParams.put("body", body);
            packageParams.put("out_trade_no", payOrderId + "");//商户订单号,自己的订单ID
            packageParams.put("total_fee", payVo.getMoneyCent() + "");//支付金额，这边需要转成字符串类型，否则后面的签名会失败
            packageParams.put("spbill_create_ip", spbill_create_ip);
            packageParams.put("notify_url", WxConfig.notify_url);//支付成功后的回调地址
            packageParams.put("trade_type", WxConfig.TRADETYPE);//支付方式
            packageParams.put("openid", openId + "");//用户的openID，自己获取

            String prestr = createLinkString(packageParams); // 把数组所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串
            logger.info("WXpayOrder prestr=[{}]",prestr);
            //MD5运算生成签名，这里是第一次签名，用于调用统一下单接口
            String mysign = sign(prestr, WxConfig.key, "utf-8").toUpperCase();

            //拼接统一下单接口使用的xml数据，要将上一步生成的签名一起拼接进去
            String xml = "<xml>" + "<appid>" + WxConfig.appid + "</appid>"
                    + "<body><![CDATA[" + body + "]]></body>"
                    + "<mch_id>" + WxConfig.mch_id + "</mch_id>"
                    + "<nonce_str>" + nonce_str + "</nonce_str>"
                    + "<notify_url>" + WxConfig.notify_url + "</notify_url>"
                    + "<openid>" + openId + "</openid>"
                    + "<out_trade_no>" + payOrderId + "</out_trade_no>"
                    + "<spbill_create_ip>" + spbill_create_ip + "</spbill_create_ip>"
                    + "<total_fee>" + payVo.getMoneyCent() + "</total_fee>"//支付的金额，单位：分
                    + "<trade_type>" + WxConfig.TRADETYPE + "</trade_type>"
                    + "<sign>" + mysign + "</sign>"
                    + "</xml>";
            logger.info("WXpayOrder xml=[{}]",xml);
            //调用统一下单接口，并接受返回的结果
            String result = httpRequest(WxConfig.pay_url, "POST", xml);
            logger.info("WXpayOrder result=[{}]",result);
            // 将解析结果存储在HashMap中
            Map map = doXMLParse(result);

            String return_code = (String) map.get("return_code");//返回状态码
            String result_code = (String) map.get("result_code");//返回状态码

            Map<String, Object> response = new HashMap<String, Object>();//返回给小程序端需要的参数
            if ("SUCCESS".equals(return_code)  && return_code.equals(result_code)) {
                String prepay_id = (String) map.get("prepay_id");//返回的预付单信息
                response.put("nonceStr", nonce_str);
                response.put("package", "prepay_id=" + prepay_id);
                Long timeStamp = System.currentTimeMillis() / 1000;
                response.put("timeStamp", timeStamp + "");//这边要将返回的时间戳转化成字符串，不然小程序端调用wx.requestPayment方法会报签名错误
                //拼接签名需要的参数
                String stringSignTemp = "appId=" + WxConfig.appid + "&nonceStr=" + nonce_str + "&package=prepay_id=" + prepay_id + "&signType=MD5&timeStamp=" + timeStamp;
                //再次签名，这个签名用于小程序端调用wx.requesetPayment方法
                String paySign = sign(stringSignTemp, WxConfig.key, "utf-8").toUpperCase();

                response.put("paySign", paySign);
            }else{

                 response.put("return_msg",map.get("return_msg"));
                 return response;
            }

            response.put("appid", WxConfig.appid);

           return response;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;

    }


    public static void main(String[] args) {

        String resXml = "";
        String ss="<xml><appid><![CDATA[wxf5d800e37a8ffe04]]></appid><bank_type><![CDATA[CFT]]></bank_type><cash_fee><![CDATA[1]]></cash_fee><fee_type><![CDATA[CNY]]></fee_type><is_subscribe><![CDATA[N]]></is_subscribe><mch_id><![CDATA[1544880371]]></mch_id><nonce_str><![CDATA[i856gnosccj6wf5uh7j97g45wn24h2op]]></nonce_str><openid><![CDATA[oWiPs4tUBVzkJ8OuaJ-d7FkaGXtQ]]></openid><out_trade_no><![CDATA[1564472357690]]></out_trade_no><result_code><![CDATA[SUCCESS]]></result_code><return_code><![CDATA[SUCCESS]]></return_code><sign><![CDATA[21D3409FFDF37D261F6C30CB9CE267C4]]></sign><time_end><![CDATA[20190730153922]]></time_end><total_fee>1</total_fee><trade_type><![CDATA[JSAPI]]></trade_type><transaction_id><![CDATA[4200000377201907308340384626]]></transaction_id></xml>";
        try {
            Map map = PayUtils.doXMLParse(ss);

            String returnCode = (String) map.get("return_code");
            System.out.println((String) map.get("return_code"));
            if ("SUCCESS".equals(returnCode)) {
                //验证签名是否正确
                Map<String, String> validParams = paraFilter(map);
                //回调验签时需要去除sign和空值参数

                String prestr = createLinkString(validParams);
                logger.info("prestr=="+prestr);
                //根据微信官网的介绍，此处不仅对回调的参数进行验签，还需要对返回的金额与系统订单的金额进行比对等
                if (verify(prestr, (String) map.get("sign"), WxConfig.key, "utf-8")) {
                    /**此处添加自己的业务逻辑代码start**/
                    logger.info("wxnotify success!");
                    //注意要判断微信支付重复回调，支付成功后微信会重复的进行回调

                    /**此处添加自己的业务逻辑代码end**/
                    //通知微信服务器已经支付成功
                    resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
                            + "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";
                }
            } else {
                resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
                        + "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public  static Map   wxNotify( InputStream in) throws Exception {


        BufferedReader br = new BufferedReader( new InputStreamReader( in ,"UTF-8"));//request.getInputStream()));
        String line = null;
        StringBuilder sb = new StringBuilder();
        while ((line = br.readLine()) != null) {
            sb.append(line);
        }
        br.close();
        //sb为微信返回的xml
        String notityXml = sb.toString();
        logger.info("wxNotify notityXml=[{}]",notityXml);
        String resXml = "";

        Map map = doXMLParse(notityXml);

        return map;

//        BufferedOutputStream out = new BufferedOutputStream( response.getOutputStream());
//        out.write(resXml.getBytes());
//        out.flush();
//        out.close();
    }

    //获取随机字符串
    private static String getRandomStringByLength(int length) {
        String base = "abcdefghijklmnopqrstuvwxyz0123456789";
        Random random = new Random();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < length; i++) {
            int number = random.nextInt(base.length());
            sb.append(base.charAt(number));
        }
        return sb.toString();
    }

    //获取IP
    public static String getIpAddr(HttpServletRequest request) {
        String ip = request.getHeader("X-Forwarded-For");
        if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) {
            //多次反向代理后会有多个ip值，第一个ip才是真实ip
            int index = ip.indexOf(",");
            if (index != -1) {
                return ip.substring(0, index);
            } else {
                return ip;
            }
        }
        ip = request.getHeader("X-Real-IP");
        if (StringUtils.isNotEmpty(ip) && !"unKnown".equalsIgnoreCase(ip)) {
            return ip;
        }
        return request.getRemoteAddr();
    }


    /**
     * 签名字符串
     *
     * @param text          需要签名的字符串
     * @param key           密钥
     * @param input_charset 编码格式
     * @return 签名结果
     */
    public static String sign(String text, String key, String input_charset) {
        text = text + "&key=" + key;
        return DigestUtils.md5Hex(getContentBytes(text, input_charset));
    }

    /**
     * 签名字符串
     *
     * @param text          需要签名的字符串
     * @param sign          签名结果
     * @param key           密钥
     * @param input_charset 编码格式
     * @return 签名结果
     */
    public static boolean verify(String text, String sign, String key, String input_charset) {
        text = text + key;
        String mysign = DigestUtils.md5Hex(getContentBytes(text, input_charset));
        if (mysign.equals(sign)) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * @param content
     * @param charset
     * @return
     * @throws java.security.SignatureException
     * @throws UnsupportedEncodingException
     */
    public static byte[] getContentBytes(String content, String charset) {
        if (charset == null || "".equals(charset)) {
            return content.getBytes();
        }
        try {
            return content.getBytes(charset);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException("MD5签名过程中出现错误,指定的编码集不对,您目前指定的编码集是:" + charset);
        }
    }

    private static boolean isValidChar(char ch) {
        if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')){
            return true;
        }

        if ((ch >= 0x4e00 && ch <= 0x7fff) || (ch >= 0x8000 && ch <= 0x952f)){
            return true;
            // 简体中文汉字编码
        }

        return false;
    }

    /**
     * 除去数组中的空值和签名参数
     *
     * @param sArray 签名参数组
     * @return 去掉空值与签名参数后的新签名参数组
     */
    public static Map<String, String> paraFilter(Map<String, String> sArray) {
        Map<String, String> result = new HashMap<String, String>();
        if (sArray == null || sArray.size() <= 0) {
            return result;
        }
        for (String key : sArray.keySet()) {
            String value = sArray.get(key);
            if (value == null || value.equals("") || key.equalsIgnoreCase("sign")
                    || key.equalsIgnoreCase("sign_type")) {
                continue;
            }
            result.put(key, value);
        }
        return result;
    }

    /**
     * 把数组所有元素排序，并按照“参数=参数值”的模式用“&”字符拼接成字符串
     *
     * @param params 需要排序并参与字符拼接的参数组
     * @return 拼接后字符串
     */
    public static String createLinkString(Map<String, String> params) {
        List<String> keys = new ArrayList<>(params.keySet());
        Collections.sort(keys);
        String prestr = "";
        for (int i = 0; i < keys.size(); i++) {
            String key = keys.get(i);
            String value = params.get(key);
            if (i == keys.size() - 1) {// 拼接时，不包括最后一个&字符
                prestr = prestr + key + "=" + value;
            } else {
                prestr = prestr + key + "=" + value + "&";
            }
        }
        return prestr;
    }

    /**
     * @param requestUrl    请求地址
     * @param requestMethod 请求方法
     * @param outputStr     参数
     */
    public static String httpRequest(String requestUrl, String requestMethod, String outputStr) {
        // 创建SSLContext
        StringBuffer buffer = null;
        try {
            URL url = new URL(requestUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod(requestMethod);
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.connect();
            //往服务器端写内容
            if (null != outputStr) {
                OutputStream os = conn.getOutputStream();
                os.write(outputStr.getBytes("utf-8"));
                os.close();
            }
            // 读取服务器端返回的内容
            InputStream is = conn.getInputStream();
            InputStreamReader isr = new InputStreamReader(is, "utf-8");
            BufferedReader br = new BufferedReader(isr);
            buffer = new StringBuffer();
            String line = null;
            while ((line = br.readLine()) != null) {
                buffer.append(line);
            }
            br.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return buffer.toString();
    }



    public static String urlEncodeUTF8(String source) {
        String result = source;
        try {
            result = java.net.URLEncoder.encode(source, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 解析xml,返回第一级元素键值对。如果第一级元素有子节点，则此节点的值是子节点的xml数据。
     *
     * @param strxml
     * @return
     * @throws org.jdom2.JDOMException
     * @throws IOException
     */
    public static Map doXMLParse(String strxml) throws Exception {
        if (null == strxml || "".equals(strxml)) {
            return null;
        }

        Map m = new HashMap();
        InputStream in = String2Inputstream(strxml);
        SAXBuilder builder = new SAXBuilder();
        Document doc = builder.build(in);
        Element root = doc.getRootElement();
        List list = root.getChildren();
        Iterator it = list.iterator();
        while (it.hasNext()) {
            Element e = (Element) it.next();
            String k = e.getName();
            String v = "";
            List children = e.getChildren();
            if (children.isEmpty()) {
                v = e.getTextNormalize();
            } else {
                v = getChildrenText(children);
            }

            m.put(k, v);
        }

        //关闭流
        in.close();

        return m;
    }

    /**
     * 获取子结点的xml
     *
     * @param children
     * @return String
     */
    public static String getChildrenText(List children) {
        StringBuffer sb = new StringBuffer();
        if (!children.isEmpty()) {
            Iterator it = children.iterator();
            while (it.hasNext()) {
                Element e = (Element) it.next();
                String name = e.getName();
                String value = e.getTextNormalize();
                List list = e.getChildren();
                sb.append("<" + name + ">");
                if (!list.isEmpty()) {
                    sb.append(getChildrenText(list));
                }
                sb.append(value);
                sb.append("</" + name + ">");
            }
        }

        return sb.toString();
    }

    public static InputStream String2Inputstream(String str) {
        return new ByteArrayInputStream(str.getBytes());
    }
}
